That's a very interesting field.
When I was in college, a friend was working on a project to try and extract a few selected elements from seawater. You can actually find most natural elements in seawater - gold included -, but it's really hard to get them because of the low concentrations.
I think I may give him a call lol
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Yeah that is what I garner from the articles I read about it. It is like parts per trillion so it is not cost effective to do anything. However, as technology progresses and energy is reworked, perhaps we will see it in a decade or two.
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